Binder for roads, &amp;c., and process of making same.



. I06- COMPOSITIONS,

COATING OR PLASTIC.

UNITED STATES To all whom it may concern Be it known that I, EDWARD A. Parna- SON, a subject of the King of Great Britain, residing in Thorold, in the Province of Ontario and Dominion of Canada, have invented certain new and useful Improvements in Binders for Roads, &-c., and Processes of Making Same, of which the following is a specification.

The object of the present invention is an efiicient petrescent binding material for use in aking rgads pavements buildin blocks dther o]ects for we ls dams, pillars and wmng qualities are particularly desirable.

My invention also includes a process for making the composition, as well as the composition.

I aim to produce a suitable binder for all agglomerates, particularly those of petrean acter.

In carrying out my invention I aim to produce in my binder a certain proportion of silicic acid or silica. To produce this eflec trea a s1 mate 0 an alkali metal, preferably 2Na. 1 or instance, W1

ori a id or som uiva ent thereof. The one am unites with a portion of the Na O content of the silicate, first replacing a chemically equivalent amount of silicic acid, which latter unites with some of the remaining sodium silicate formin a sodium silicate riche in silica than at on ma v use en a pom 1s reac e at w 110 1 more s1 mat is present than can stay-combined as silicate, a portion is set free, first forming soluble silicic acid which later becomes converte into the insoluble form, 510,.

e binder after use gradually rbs 0 fr the air. formin more SiO., anc Q anC 3 or NaHCI) which ii'ith the Nani? 0 pro uce u ction of how on sodium silicate, are gradually leached out, by rain or other water, leaving t e of silica to act as a binder, for which purpose it is highly efiicient. The leachings being in very dilute condition are harmless to vegetation, to the feet of horses, to organic matter, etc., with which it may 50 come into contact. As a of procedure, and in order to economize 1n the use of bone acid, I may ce a part of such acid by gm chlorid. In is the calcium chlori reac s EDWARD ALFRED PATERSON, OF THOBOLD, CANADA.

BINDER FOR ROADS, 866., AND PROCESS OF MAKING SAME. W

Patented May 21, 1918.

1,266 618 Specification of Letters Patent. 1 w

i No Drawing. Application filed January 5, 1916. Serial No. 70,481.

to produce calcium hydroxid, and the chlo- 1m and sodium unite, forming sodium chlorid, which is soluble. The calcium hydroxid will subsequently combine with a portion of the free silicic acid to form a silicate.

The advantage of using an alkali metal silicatrzwith a silica content as higli as that stated is that the part left behind after use, and after the soluble products of the reaction have been washed away, is comparatively large. It is not only large but the silica left is hard, resistant, inert and endurin As a suitable silicate of the kind I need, may mention one havin the formula 2Na O.3SiO inHO. TheTiinder produced in accor ance wi e present invention is to be employed in the manner now well understood in the art, as more fully described in my Patent 1,171,236, issued February 8, 1917.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A petrescent binder for agglomerates of petrean character, containing a silicate of an alkali metal, free silicic acid, and a constituent gradually removable by weathering.

2. A binder for stony agglomerates consisting of a soluble sodium silicate, calcium chlorid, freed silicic acid, and a constituent adually removable by weathering.

3. The method herein described of producing a petrescent binder, for agglomerates of a petrean character which comprises adding to a solution of a silicate of an alkali metal, an acid capable of combining with a portion of the alkali metal base to form a salt which in solution is harmless to organic substances, and thus freeing a portion of the silica content of the silicate.

4. The method herein described of producing a petrescent binder for agglomerates of a petrean character, which consists in treating a solution of an alkali metal silicate havin a high silica content with a soluble ha oid salt of an alkaline earth metal and with an acid capable of combining with alkali metal base of such silicate to form a salt which in solution is harmless to organic substances, and thus forming an insoluble silicate and freeing a portion of the silica content of the silicate.

5. The method herein described of producing a petrescent binder for agglomerates of a petrean character, which oonsists in treating In testimony whereof, I have hereunto suba solution of a sodium silicate, with calcium scribed my name.

chlorid and with boric acid whereby part I q T of the silica is set free as silicic acid and an EDWARD ALFRED PATERbOhf 5 insoluble calcium silicate together wlth solu- Witnesses:

ble sodium chlorid and sodium borate are LLOYD B. VYIGHT, formed. M. E. BU'RRELL.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

